The Late Show host asked C.K. how his perception of Trump has changed.

“Now, I guess he’s not as profound as I thought he was. I thought he was some new kind of evil. But he’s just a lying sack of sh*t,” the comedian explained.

He went on to explain the difference in his mind between certain people who tell lies. “Sometimes people lie. ‘That guy lied, they found out he lied.’ And then there’s somebody who lies once in a while, can’t quite stay inside the boundaries of truth, right? Somebody who lies sometimes.”

“Then you have a liar, who’s somebody who has a problem, they can’t help it, they lie a lot. And then you have a lying sack of sh*t… They like it, he likes it… It’s insane, he’s just a gross, crook, dirty, lying sack of sh*t,” C.K. said of Trump.

“Because if enough people say something is popular, I might trust that it’s good,” Colbert said. “It’s like how if one person tells me how Transformers is a good movie. I might not see it. But if everyone on Facebook is raving about it, I’ll go. And by the time I realize I was lied to, Megatron is president.”